Best Answer: I have been a police officer for almost 40 years. Just like civilian communication, police communication has evolved over the years, Before two-way radios, officers could call into headquarters on call boxes, which were located at various locations on their beats. was just wondering, how exactly did police officers communicate with one another before cellphones were widely used (early 70s era specifically)?
3 Stars. Nitroglycerin is used to treat congestive heart failure, to help prevent frequent chest pain caused by a heart condition known as angina, and to relieve pain caused by chronic anal fissures. The drug is available under the brand names Nitromist, Nitrobid, Nitro-Dur, Nitrostat, Imdur, Isordil and Rectiv.
Quick-acting forms of nitroglycerin are used to relieve angina or used just before activities that typically cause angina. The quick-acting forms include tablets or oral sprays. The tablets are placed under the tongue (sublingual) or between the cheek and gum (buccal). The spray is used on or under the tongue. Taking nitroglycerin can lower your blood pressure, which could cause you to pass out if you are standing up. 2  For sudden episodes of angina, use nitroglycerin in a tablet or liquid spray form. 3  Place the under-the-tongue (sublingual) tablet under your tongue. 4  Leave it there until it dissolves.